Update file_permissions.rst

Author: axzx

setup/file_permissions.rst

@@ -4,7 +4,7 @@ Setting up or Fixing File Permissions
 In Symfony 3.x, you needed to do some extra work to make sure that your cache directory
 was writable. But that is no longer true! In Symfony 4, everything works automatically:
 
-* In the ``dev`` environment, ``umask()`` is used in ``bin/console`` and ``web/index.php``
+* In the ``dev`` environment, ``umask()`` is used in ``bin/console`` and ``public/index.php``
   so that any created files are writable by everyone.
 
 * In the ``prod`` environment (i.e. when ``APP_ENV`` is ``prod`` and ``APP_DEBUG``